Republican Party officials do not yet know if Vice President George Bush will visit the Lehigh Valley on Monday, but the possible campaign stop has sent officials scurrying to arrange details in case the presidential candidate arrives.

An estimated 400 tickets are on sale for a $100-a-plate fund-raising breakfast with Bush at Lehigh University. If Bush doesn't come, officials say, the money will be refunded.

Other parts of the itinerary, including a possible Bush visit to the Lehigh Valley Industrial Park and to the Bucks County area, could not be confirmed yesterday. Members of Bush's advance team were said to be in the area.

Local campaign officials, who said the whole visit might be scrapped if all of the details don't come together in time, may have an announcement on the planned visit today.

Bush is tentatively scheduled for an 8:15 a.m. breakfast in the main dining room of Lehigh's Mountaintop Campus on South Mountain. Tickets are being sold for the breakfast at Lehigh in anticipation of the event taking place.

"Tickets are being sold, which tells you how hopeful we are that it will happen," said Bethlehem attorney Bruce Davis, co-chairman of the Bush campaign for a region including the Lehigh Valley. "We have the tickets. All we don't have is the confirmation that the breakfast will be held."

Jim Harper, Lehigh's director of community relations, said the university is scrambling to arrange the affair even though no one knows for sure if Bush will ever set foot on campus. He said Lehigh will have to order food, hire extra staff and arrange Secret Service clearances to handle the breakfast.

"We still don't have anything definite," Harper said yesterday. "But we have to prepare for this event if it does happen."

Davis said Republican Party headquarters for Lehigh and Northampton counties, at the Hotel Traylor in Allentown and at the Farr Building in Bethlehem, respectively, should be contacted by people interested in buying tickets. The money will be refunded if the event is scratched, he said. The 400 tickets will be sold on a first-come, first-served basis.

Davis said the event is being sponsored by the Victory '88 Committee, and not the Bush for President Committee. He said Victory '88 is a fund-raising organization for Republican candidates in Pennsylvania. The money could be used for phone banks, mailings and the like for the Bush-Quayle ticket, for U.S. Sen. John Heinz's re-election bid, and for that of U.S. Rep. Don Ritter, R-15th District, as well as other Pennsylvania Republican candidates, Davis said.

"The money goes to the county organizations," he said.

The Lehigh Valley has proven to be a popular stop for presidential candidates and their entourages this year.

Democratic presidential nomineeMichael Dukakis made a primary campaign speech at Bethlehem Steel Corp. on April 23, though a planned visit to the Ben Franklin technology center had to be scratched. The candidate took the chance to heap praise on the Ben Franklin program, however, saying the idea of linking government, business and universities should be nurtured on a national scale.

Ironically, presuming Bush does appear here Monday, a proposed stop at the technology center probably will not take place because of the brisk time schedule, Davis said.

Barbara Bush, wife of the Republican nominee, made appearances in Allentown and environs on April 25, two days after the Dukakis visit.

Davis said yesterday that a possible visit to Bethlehem by Mrs. Bush tomorrow is still a possibility, but he added that "that conversation was not nearly so active today as it was yesterday."